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Note 7 - Revenue 1 (Details Textual) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
Coal [Member] |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total |  |  | $ 12,800,000
Coal [Member] | INDIANA | Revenue from Contract with Customer Benchmark [Member] | Geographic Concentration Risk [Member] |  |  |
Concentration Risk, Percentage | 74.00% | 73.00% |
Electricity, Purchased [Member] | Hoosier Energy [Member] |  |  |
Long-Term Purchase Commitment, Minimum Quantity Required, Percentage | 70.00% |  |
Long-term Purchase Commitment, Minimum Quantity Required, Price Per Megawatt Hour | $ 34.00 |  |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year One | 917 |  |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Megawatts Provided Year Two Through Four | 300 |  |
Long-term Purchase Commitment, Stand Ready Obligation, Contract Capacity, Price Per Kilowatts-month | $ 5.80 |  |

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126942793&loc=d3e3073-115593 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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